This device, Lets you stream music and calls directly from your Bluetooth device to your car FM stereo system.The built-in microphone provides you with an amazing hands free function, it also features a USB and SD card reader that lets you steam your favorite MP3 and WMA tunes to your car?s stereo system.Play music files from external device by connecting your music device using the Aux port too. It also can charge your phone using the DUAL USB charging Port. Its Bluetooth chip can be used with a wide range of devices which can make can your driving more interesting.